/Engine/Source/Runtime/Engine/Public/WorldPartition/HLOD/HLODBuilder.h
From a set of components, compute a unique hash from their properties that are relevant to HLOD generation. Used to detect changes to the source actors and trigger an HLOD rebuild if necessarry.
static uint32 ComputeHLODHash ( const [TArray](API\Runtime\Core\Containers\TArray)< [UActorComponent](API\Runtime\Engine\Components\UActorComponent) * > & InSourceComponents )